Name: C++ File Handling
Uploaded: 2026-05-15
Duration: 5 min 59 s
Description: C++. File Handling. Reading, writing, appending, and managing records using file streams.

C++. File Handling. Reading, writing, appending, and managing records using file streams. 

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Reading, writing, appending, and managing records using file streams

Lecture deck with examples, common errors, and a mini-project activity

C++ File Handling. 02. Learning Objectives. By the end of the discussion, students should be able to:. 

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By the end of the discussion, students should be able to:

Explain why programs need files for permanent storage. Differentiate ofstream, ifstream, and fstream. Write, read, and append text file data in C++. Check file-opening errors before processing data. Build a simple record-based program using files.

C++ File Handling. 03. Why File Handling Matters. 

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Variables are temporary; files are persistent.

Data disappears after the program ends. Reports must be retyped manually. No stored history or records.

Data can be saved permanently. Programs can read old records later. Useful for attendance, grades, inventory, and reports.

C++ File Handling. 04. C++ File Stream Classes. Include <fstream> to access file stream objects.. 

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Include <fstream> to access file stream objects.

C++ File Handling. 05. Basic File Operation Workflow. 

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Most file-handling programs follow this pattern.

ofstream file("sample.txt"); if (!file) file << "Hello"; file.close();

C++ File Handling. 06. Writing to a File with ofstream. 

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Use ofstream when your program sends output to a file.

#include <iostream> #include <fstream> using namespace std;
 int main()

Creates sample.txt if it does not exist. Overwrites old content by default. Uses << just like cout. close() finalizes the write operation.

C++ File Handling. 07. Reading from a File with ifstream. 

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Use ifstream when your program receives input from a file.

#include <iostream> #include <fstream> #include <string> using namespace std;
 int main()
     file.close();     return 0; }

getline() reads one full line. The while loop stops at end-of-file. Each line can be displayed or processed. Always check for file errors in real programs.

C++ File Handling. 08. Checking If a File Opened Successfully. 

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A program should not process a file that failed to open.

ifstream file("students.txt");
 if (!file)
 cout << "File opened successfully." << endl;

Wrong filename Wrong folder/path File does not exist No permission to access the file

Place the text file in the same working directory used by your compiler or IDE.

C++ File Handling. 09. getline() vs. Extraction Operator >>. 

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Choose based on whether you need a whole line or a single token.

getline(file, name);   // reads: Juan Dela Cruz

Use getline() for names, addresses, and sentences.

C++ File Handling. 10. Common File Modes. Modes tell C++ how the file should be opened.. 

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Modes tell C++ how the file should be opened.

ofstream file("records.txt", ios::app); ifstream inFile("records.txt", ios::in); fstream data("records.txt", ios::in | ios::out);

Tip: ofstream with no mode usually overwrites existing file content.

C++ File Handling. 11. Appending Records. Use ios::app when you want to add new data without deleting old data.. 

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Use ios::app when you want to add new data without deleting old data.

ofstream file("students.txt", ios::app);
 string name; cout << "Enter student name: "; getline(cin, name);
 file << name << endl; file.close();

C++ File Handling. 12. Saving Structured Records. 

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For simple projects, each line can represent one complete record.

file << name << "," << age << "," << grade << endl;

Maria Santos,18,92.5 Juan Cruz,19,88.0 Lia Reyes,18,95.0

Easy to write line by line Readable in text editors Can be imported into spreadsheets Needs parsing when reading back

C++ File Handling. 13. Mini-Project: Student Record System. 

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A menu-driven program can combine writing, reading, and appending.

===== Student Record System ===== 1. Add Student 2. View Students 3. Exit Enter choice:

Choice 1: open students.txt using ios::app and save a new record. Choice 2: open students.txt using ifstream and display every line. Choice 3: end the loop and close the program.

This is a simple file-based record system.

C++ File Handling. 14. Common Mistakes and Quick Fixes. 

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Most beginner problems are caused by file paths, modes, or input handling.

Use getline() for full names or sentences.

Make sure the file was written and closed.

Use cin.ignore() before getline() after cin.

cin >> age; cin.ignore();      // clears leftover newline getline(cin, name);

C++ File Handling. 15. Class Activity: Student Grade Recorder. 

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Build a program that saves and displays student grades.

Ask for student name, subject, and grade. Save each record to grades.txt. Use append mode so old records remain. Add a menu option to view all saved records. Check if the file opens successfully.

Maria Santos,Programming,92 Juan Cruz,Database,88

Challenge: compute and display the average grade.

Submission: source code + sample grades.txt

C++ File Handling. 16. Summary. File handling lets C++ programs store and retrieve data permanently.. 

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File handling lets C++ programs store and retrieve data permanently.

Use ofstream to write to files. Use ifstream to read from files. Use fstream when both reading and writing are needed. Use ios::app to add data without deleting existing content. Always check the file before processing it.

When should you use ios::app instead of the default ofstream behavior?

C++ File Handling

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